poorly gsi

Hi all having a few problems with my gsi wonder if any 1 can help i have an oil leak which iv told u about which i will b doing monday but i had the cam belt done the other day along with the oil return pipe & since iv got ot back its chucking out loads smoke manly when i sit in traffic than pull away it chucks out clouds of smoke & then on as i drive along it didnt do this b4 only every now & then (it is blue smoke)could it b chance that the turbo went at the same time please help